软键盘技术研究和改进

该文介绍了软键盘密码输入技术的工作原理,分析了"屏幕快照"黑客窃密技术的攻击原理和流程,针对当前软键盘技术存在的问题提出了相应的改进方案,并用VB编程实现了改进后的软键盘程序。     

计算机CPU的主要性能指标分析及常见故障的排除

CPU是计算机进行运算的核心,主要性能指标有字长、频率、高速缓存、前端总线频率、超线程技术的应用、支持的扩展指令集等对整个计算机的性能起着至关重要的作用。在计算机的使用中常见的CPU超频故障、计算机感染病毒使CPU性能大幅度下降,偶伴随死机等现象,逐步掌握CPU主要性能与故障的排除技巧,达到举一反三的效果。     

镜头式光幕靶信号处理电路设计与实现

为了解决传统光幕靶靶面小、灵敏度低、结构复杂等问题,分析了一种镜头式光幕靶的工作原理,搭建了相应的原理样机,设计了一种可监测镜头式光幕靶状态、具有程控放大功能的信号处理电路．经过气枪实弹测试验证,当电路设置为低灵敏度状态时,对于弹径为5mm、过幕点距离镜头1m处的弹丸,信号处理电路输出信号幅值达到2V以上,噪声信号控制在0．5V以内．     

The effects of design,size, and uniqueness of smartwatches: perspectives from current versus potential users

ABSTRACT

This study proposes design, uniqueness, and screen size as the key components of aesthetic appeal and investigates their role in influencing the use behaviour of current smartwatch users and purchase intentions of potential users. Hypotheses were tested using SmartPLS to analyze data collected from 377 current smartwatch users and 361 potential users. Design aesthetics was found to be the most important factor influencing the behavioural intentions of both user groups. Screen size and uniqueness had significant effects on current users’ use behaviour and potential users’ purchase intentions, respectively. Gender moderated the effect of design on the use behaviour of current smartwatch users, such that female users’ behaviour was more likely to be influenced than male users. A subsequent analysis on the moderating effect of brand revealed that the design aesthetics of smartwatches mattered more for Apple than Samsung in terms of promoting use behaviour.     

气象预警管理系统在宁夏农村防灾减灾中的应用

以LED电子屏和语音大喇叭的气象预警管理系统在宁夏农村防灾减灾建设中的研究为背景,介绍该系统的结构、功能和特点,以及使用中存在的问题和对策等.该气象预警管理系统基于C/S架构,结合了LED气象预警电子屏终端和语音大喇叭,主要实现面向LED电子屏及大喇叭的气象预报、预警信息编辑、录入、审核、发布与GPRS终端管理等功能,为宁夏农村气象信息服务和防灾减灾服务提供安全、快捷、有效的发布管理平台.     

Eye-strain and changes in accommodation of the eye and in visual evoked potential following quantified visual load

The measurements were made of the muscular contractions and relaxations of accommodation (infrared optometer) and of visual evoked potential (VEP) (photic stimulation) before and after one hour's visual load, checking calculations (1800 questions/hour and 900 questions/hour). The results showed that the relaxation time in accommodation lengthened and the latency of the positive wave appearing at about 100 ms in VEP increased with the increase in visual load. In addition, the complaint rate for eye-strain was higher in the group given heavier visual work. In this group, there was no significant difference in amplitude of VEP before and after the visual task. The difference in the relaxation time before and after the visual task tended to be negatively correlated to the difference in amplitude of VEP and positively related to that in the latency. In the group given lighter visual work there were significant differences in the latency and the amplitude of VEP before and after the visual task, neither were correlated to the difference in the relaxation time. These results suggest that not only peripheral hypofunction but also the decrease of centrencephalic activity level may be responsible for the development of eye-strain caused by visual tasks.     

基于VFD显示触屏定时器的分析与设计

随着社会对家电产品期望值的提高,智能化成为家电产品发展的必然趋势．目前,智能家电已经能够实现家电附加值的提升．在阐述了电烤箱定时器设计性能指标,以及调研分析的基础上,提出了实现智能电烤箱控制的硬件电路设计方案,对智能电烤箱硬件电路的工作原理进行了分析,并对各个电路模块进行了介绍．同时,进行了定时器电路印制板的设计和指令汇编,实现了智能控制方案,对VFD显示触屏定时器通过调试验证,符合产品的实际工作性能要求．     

基于亚龙235PLC的酒加工控制系统的研究

自本文以亚龙235 PLC实验装置为基础,研究了酒加工的工业控制过程,从硬件和软件2方面来进行阐述,并简单设计了用触摸屏来控制加工过程,适用于职业学校PLC课程的拓展应用。     

基于PLC及伺服控制器的自动卷绕控制设计

基于伺服控制器、可编程控制器(PLC)及触摸屏技术,完成了自动卷绕生产过程的硬件设计规划、I/O定义、电气原理图及相关程序等.采用PLC完成送料、夹紧、切断、拉断等工序的自动循环.由PLC程序判断输入设备的状态,给出正确的控制指令,然后通过定位模块输出定位脉冲给伺服驱动器,控制电机运行.采用触摸屏完成生产过程的画面监控、参数设置及指令下达等任务.最终测试结果表明,系统运行可靠,且提高了工作效率.     

大型直线振动筛的疲劳寿命分析

由于在简谐激振力作用下大型直线振动筛在振动筛分工作时其横梁、侧板等主体结构件均处于多轴应力状态,因此利用临界平面法对大型直线振动筛的多轴疲劳损伤模型进行了疲劳寿命数值分析,得到了大型直线振动筛的对数疲劳寿命云图并分析了振动筛结构的疲劳寿命分布。分析可知,大型直线振动筛整体的疲劳寿命可以满足工作需要,疲劳可靠性较高,但振动筛体的侧板、横梁的局部疲劳安全系数不高,在设计使用过程中应引起足够的重视,必要时对大型直线振动筛的结构件进行优化重设计。